Product and sub-runner material connecting structure for avoiding thermal deformation at sprue
By using a connecting bridge structure in the injection molding of automotive lamps, the problem of appearance sink marks caused by thermal deformation near the gate is solved, material costs are reduced, and product quality is maintained.
Patent Information
- Application Number
- CN202422494988.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-15
AI Technical Summary
During the injection molding process of automotive lamps, high-temperature thermal deformation near the gate causes appearance shrinkage. Existing technology requires the use of high-cost materials to avoid this defect, increasing production costs.
A connecting bridge structure is used to connect the gate to the runner material, and the L-shaped connecting bridge is used to connect the product and the gate material as a whole to form a gap to prevent thermal deformation from directly affecting the product. The connecting bridge can be cut off later to remove the defective part.
It effectively avoids the problem of thermal deformation and shrinkage near the gate, reduces material costs, maintains product appearance quality, and does not increase raw material costs.
Smart Images
Figure CN223326856U_ABST
Abstract
Description
Technical field:
[0001] The utility model relates to the technical field of injection molding of automobile lamps, in particular to a product and runner material connection structure for avoiding thermal deformation at a gate. Background technology:
[0002] In the field of automotive lighting, the lampshades of car taillights are mainly made of bright red, bright white and black PMMA. With the development of technology and industry, large areas of black have become the trend of car taillights, and high-gloss black is indeed high-end, classy and full of technology.
[0003] However, large areas of black also have certain disadvantages. Black absorbs heat, and the temperature is rising year by year. Under the irradiation of hot sunlight, the surface of the lampshade will also generate high heat. When the temperature is higher than the thermal deformation temperature that the material itself can withstand, defects such as deformation and shrinkage will appear on the surface of the product. Among them, this defect will be particularly obvious near the gate of the product. This is because the commonly used types of gate design in injection molds are point gates and side gates. Regardless of the type, the gate is designed directly on the product mold cavity, so that after injection molding, the gate material 102 formed at the gate is directly connected to the product 101. The gate material 102 is connected to the runner material 103, such as Figure 1 However, during the injection molding process, severe shearing of the gate material generates high heat, which in turn causes the temperature of the surrounding material to rise. This high temperature can damage the chemical bonds in the material, thereby degrading its physical properties. This can cause thermal deformation near the cutout where the product 101 connects to the gate material 102, resulting in shrinkage on the product's appearance. This means that under high temperature conditions, thermal deformation near the gate of the product 101 (i.e., the connection between the product 101 and the gate material 102) can severely cause shrinkage on the product's appearance, which is unavoidable.
[0004] To avoid this defect, the simplest way is to replace it with a material that can withstand a higher thermal deformation temperature. However, the higher the thermal deformation temperature of the material, the higher its cost. The increase in material cost will directly lead to an increase in the cost of lamps. In the current highly competitive market environment, this is very disadvantageous for lamp manufacturers and even car companies.
[0005] In view of this, if it is necessary to use expensive materials without increasing costs, it is necessary to find other ways to avoid the defect of thermal deformation near the gate based on the original ordinary heat-resistant materials. Therefore, the inventors propose the following technical solutions. Utility model content:
[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a product and runner material connection structure for avoiding thermal deformation at the gate.
[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: the product and runner material connection structure for avoiding thermal deformation at the gate includes: an injection molded product, a gate material, and a runner material, and the gate material and the runner material are connected as one piece, and is characterized in that: it also includes a connecting bridge, which is integrally connected between the product and the gate material, so that a gap is formed between the product and the gate material.
[0008] Furthermore, in the above technical solution, the connecting bridge is L-shaped, and includes a first connecting portion and a second connecting portion that are connected to each other and form an angle, and the angle between the first connecting portion and the second connecting portion is greater than 90 degrees, and the end of the first connecting portion is connected to the product, and the end of the second connecting portion is connected to the gate material.
[0009] Furthermore, in the above technical solution, the angle between the first connecting portion and the second connecting portion is 100±3 degrees.
[0010] Furthermore, in the above technical solution, the widths of the first connecting portion and the second connecting portion are equal.
[0011] Furthermore, in the above technical solution, the thickness of the first connection part and the second connection part of the connection bridge are both 2.5 mm; and a notch is provided at the end of the first connection part of the connection bridge.
[0012] Furthermore, in the above technical solution, the thickness of the end of the first connecting portion of the connecting bridge is 1 mm, and the width of the gap is 2 mm.
[0013] Furthermore, in the above technical solution, the notch is an arc-shaped notch.
[0014] Furthermore, in the above technical solution, the length of the connecting bridge is less than or equal to 50 mm.
[0015] Furthermore, in the above technical solution, the length of the gate material is 14.5 mm.
[0016] Furthermore, in the above technical solution, the minimum distance between the side of the gate material and the side of the connecting bridge is 2.5 mm.
[0017] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art: the utility model makes the injection molding gate of the product on the connecting bridge instead of directly setting it on the product, so that after the injection molding is completed, the connecting bridge is integrally connected between the product and the gate material, so that a gap is formed between the product and the gate material, so that the problem of appearance shrinkage near the gate caused by thermal deformation can be left on the connecting bridge, that is, during the injection molding process of the product, severe shearing of the gate to generate high heat will not act on the product, but on the connecting bridge, so that the problem of appearance shrinkage due to thermal deformation will not appear on the product, and after the injection molding of the product is completed, the connecting bridge will be cut off from the product, so that the defective part near the gate will be cut off together with the connecting bridge, instead of remaining in the product itself, thereby effectively avoiding the problem of appearance shrinkage caused by thermal deformation near the gate of the product. Description of the drawings:
[0018] Figure 1 It is a three-dimensional diagram of the product injection molding structure;
[0019] Figure 2 It is a three-dimensional diagram of the utility model;
[0020] Figure 3 It is a three-dimensional diagram of the product's injection molding structure from another perspective;
[0021] Figure 4 It is the main view of the utility model;
[0022] Figure 5 It is a cross-sectional view of the present utility model. Specific implementation method:
[0023] The present invention will be further described below with reference to specific embodiments and accompanying drawings.
[0024] See Figure 2-5As shown, a product and runner material connection structure for avoiding thermal deformation at the gate includes: an injection molded product 2, a gate material 3, a runner material 4, and a connecting bridge 5. The gate material 3 is integrally connected to the runner material 4, and the two ends of the connecting bridge 5 are integrally connected to the product 2 and the gate material 3 respectively, that is, the connecting bridge 5 is integrally connected between the product 2 and the gate material 3, so that a gap is formed between the product 2 and the gate material 3. That is to say, the present invention makes the injection molding gate of the product on the connecting bridge 5 instead of setting it directly on the product, so that after the injection molding is completed, the connecting bridge 5 is integrally connected between the product 2 and the gate material 3, so that a gap is formed between the product 2 and the gate material 3, so that the appearance shrinkage problem caused by thermal deformation near the gate will remain on the connecting bridge 5, that is, during the injection molding process of the product, the gate shearing is severe and the high heat generated will not act on the product 2, but on the connecting bridge 5, so that the appearance shrinkage problem caused by thermal deformation will not appear on the product 2. After the injection molding of the product 2 is completed, the connecting bridge 5 is cut out from the product, so that the defective part near the gate is also cut off along with the connecting bridge 5, instead of remaining in the product itself, so that the problem of appearance shrinkage caused by thermal deformation near the product gate (i.e., the gate) can be well avoided. Among them, the cutting of the connecting bridge 5 adopts manual trimming.
[0025] In this embodiment, the connecting bridge 5 is L-shaped and includes a first connecting portion 51 and a second connecting portion 52 that are connected to each other and form an angle. The angle between the first connecting portion 51 and the second connecting portion 52 is greater than 90 degrees. The end of the first connecting portion 51 is connected to the product 2, and the end of the second connecting portion 52 is connected to the gate material 3. This allows a gap to be formed between the product 2 and the gate material 3, ensuring that the gap between the product 2 and the gate material 3 is not too large, thereby reducing mold costs. Of course, the connecting bridge 5 can also have other shapes, such as a large-angle bend (such as 150-160 degrees); a curved arc; a V-shape, etc.
[0026] The length of the connecting bridge 5 is less than or equal to 50 mm. Specifically, the length of the connecting bridge 5 is 50 mm, which is moderate. If it is too long, it will be difficult to trim. Manual trimming is still possible within this size, but laser trimming is required if the size exceeds this size.
[0027] The first connecting portion 51 and the second connecting portion 52 are equal in width, which is beneficial to the product mold structure design and reduces the mold cost to a certain extent. The first connecting portion 51 and the second connecting portion 52 are both 18.5 mm wide.
[0028] As an optional embodiment, in this embodiment, the angle between the first connecting portion 51 and the second connecting portion 52 is 100±3 degrees. Specifically, the angle between the first connecting portion 51 and the second connecting portion 52 is 103 degrees, that is, an obtuse angle, which is also beneficial to the product mold structure design and reduces the mold cost to a certain extent.
[0029] The thickness of the first connecting portion 51 and the second connecting portion 52 of the connecting bridge 5 are both 2.5 mm, which facilitates the flow of plastic particles during the injection molding process.
[0030] The end of the first connection portion 51 of the connection bridge 5 is provided with a notch 511 , which can reduce the thickness of the end of the first connection portion 51 and make it easier to cut, even to cut manually.
[0031] The thickness of the end of the first connecting portion 51 of the connecting bridge 5 is 1 mm, which refers to the distance between the bottom of the notch 511 and the other plate surface of the first connecting portion 51 . The width of the notch 511 is 2 mm.
[0032] The notch 511 is an arc-shaped notch.
[0033] The length of the gate material 3 is 14.5 mm, which is the length of a general side gate and is beneficial to the product mold structure design.
[0034] The minimum distance between the side of the gate material 3 and the side of the connecting bridge 5 is 2.5 mm. This thickness facilitates the flow of plastic particles during the injection molding process and improves the injection molding quality.
[0035] To sum up, the utility model makes the injection molding gate of the product on the connecting bridge 5 instead of directly setting it on the product, so that after the injection molding is completed, the connecting bridge 5 is integrally connected between the product 2 and the gate material 3, so that a gap is formed between the product 2 and the gate material 3, so that the problem of appearance shrinkage near the gate caused by thermal deformation can be left on the connecting bridge 5, that is, during the injection molding process of the product, severe shearing of the gate to generate high heat will not act on the product 2, but on the connecting bridge 5, so that the problem of appearance shrinkage due to thermal deformation will not appear on the product 2, and later after the injection molding of the product 2 is completed, the connecting bridge 5 will be cut off from the product, so that the defective part near the gate will be cut off together with the connecting bridge 5, instead of remaining in the product itself, thereby effectively avoiding the problem of appearance shrinkage caused by thermal deformation near the product gate.
[0036] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.
Claims
1. The product and runner material connection structure used to avoid thermal deformation at the gate includes: An injection molded product (2), a gate material (3), and a runner material (4), wherein the gate material (3) and the runner material (4) are integrally connected, and the invention is characterized in that it also includes a connecting bridge (5), wherein the connecting bridge (5) is integrally connected between the product (2) and the gate material (3), so that a gap is formed between the product (2) and the gate material (3).
2. The product and runner material connection structure for preventing thermal deformation at the gate according to claim 1, characterized in that: The connecting bridge (5) is L-shaped and comprises a first connecting portion (51) and a second connecting portion (52) which are connected to each other and form an angle, and the angle between the first connecting portion (51) and the second connecting portion (52) is greater than 90 degrees. The end of the first connecting portion (51) is connected to the product (2), and the end of the second connecting portion (52) is connected to the gate material (3).
3. The product and runner material connection structure for preventing thermal deformation at the gate according to claim 2, characterized in that: The included angle between the first connecting portion (51) and the second connecting portion (52) is 100±3 degrees.
4. The product and runner material connection structure for preventing thermal deformation at the gate according to claim 2, characterized in that: The first connecting portion (51) and the second connecting portion (52) have the same width.
5. The product and runner material connection structure for preventing thermal deformation at the gate according to any one of claims 2 to 4, characterized in that: The thickness of the first connecting portion (51) and the second connecting portion (52) of the connecting bridge (5) are both 2.5 mm; a notch (511) is provided at the end of the first connecting portion (51) of the connecting bridge (5).
6. The product and runner material connection structure for preventing thermal deformation at the gate according to claim 5, characterized in that: The thickness of the end of the first connecting portion (51) of the connecting bridge (5) is 1 mm, and the width of the notch (511) is 2 mm.
7. The product and runner material connection structure for preventing thermal deformation at the gate according to claim 5, characterized in that: The notch (511) is an arc-shaped notch.
8. The product and runner material connection structure for preventing thermal deformation at the gate according to any one of claims 1 to 4, characterized in that: The length of the connecting bridge (5) is less than or equal to 50 mm.
9. The product and runner material connection structure for preventing thermal deformation at the gate according to claim 8, characterized in that: The length of the gate material (3) is 14.5 mm.
10. The product and runner material connection structure for preventing thermal deformation at the gate according to claim 9, characterized in that: The minimum distance between the side of the gate material (3) and the side of the connecting bridge (5) is 2.5 mm.